Is cosmic acceleration proven by local cosmological probes?

Abstract

Context: The cosmological concordance model ($\Lambda$CDM) matches the cosmological observations exceedingly well. This model has become the standard cosmological model with the evidence for an accelerated expansion provided by the type Ia supernovae (SNIa) Hubble diagram. However, the robustness of this evidence has been addressed recently with somewhat diverging conclusions. Aims: The purpose of this paper is to assess the robustness of the conclusion that the Universe is indeed accelerating if we rely only on low-redshift (z$\lesssim$2) observations, that is to say with SNIa, baryonic acoustic oscillations, measurements of the Hubble parameter at different redshifts, and measurements of the growth of matter perturbations. Methods: We used the standard statistical procedure of minimizing the ${\chi }^2$ function for the different probes to quantify the goodness of fit of a model for both $\Lambda$CDM and a simple nonaccelerated low-redshift power law model. In this analysis, we do not assume that supernovae intrinsic luminosity is independent of the redshift, which has been a fundamental assumption in most previous studies that cannot be tested. Results: We have found that, when SNIa intrinsic luminosity is not assumed to be redshift independent, a nonaccelerated low-redshift power law model is able to fit the low-redshift background data as well as, or even slightly better, than $\Lambda$CDM. When measurements of the growth of structures are added, a nonaccelerated low-redshift power law model still provides an excellent fit to the data for all the luminosity evolution models considered. Conclusions: Without the standard assumption that supernovae intrinsic luminosity is independent of the redshift, low-redshift probes are consistent with a nonaccelerated universe.

8 pages, 3 figures

References in corpus (9)

• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• Baryon Acoustic Oscillations in the Lyα forest of BOSS DR11 quasars
• Baryon Acoustic Oscillations in the Ly-α forest of BOSS quasars
• Is the expansion of the universe accelerating? All signs point to yes
• Constraints on cosmological parameters in power-law cosmology
• Robust model comparison disfavors power law cosmology
• Power law cosmology model comparison with CMB scale information
• Power-law cosmology, SN Ia, and BAO
• Quantifying systematic uncertainties in supernova cosmology

Cited by in corpus (24)

• Baryon acoustic oscillations from the complete SDSS-III Ly$\alpha$-quasar cross-correlation function at $z=2.4$
• Robust Preference for Dynamical Dark Energy in DESI BAO and SN Measurements
• Early-type Host Galaxies of Type Ia Supernovae. II. Evidence for Luminosity Evolution in Supernova Cosmology
• Apparent cosmic acceleration from type Ia supernovae
• The state of the dark energy equation of state circa 2023
• On the homogeneity of SnIa absolute magnitude in the Pantheon+ sample
• Soundness of Dark Energy properties
• Do supernovae indicate an accelerating universe?
• The size of our causal Universe
• Inevitable manifestation of wiggles in the expansion of the late Universe
• Effects of type Ia supernovae absolute magnitude priors on the Hubble constant value
• Cosmology and the massive photon frequency shift in the Standard-Model Extension
• New late-time constraints on $f(R)$ gravity
• Backreaction and FRW consistency conditions
• DE models with combined $H_0\cdot r_d$ from BAO and CMB dataset and friends
• A possible late-time transition of $M_B$ inferred via neural networks
• Antimatter gravity and the Universe
• Magnification and evolution bias of transient sources: GWs and SNIa
• Anisotropy in the cosmic acceleration inferred from supernovae
• Antimatter Gravity and the Results of the ALPHA-g Experiment
• Testing the Constancy of Type Ia Supernova Luminosities with Gaussian Process
• Calibrating the effective magnitudes of type Ia supernovae with a model-independent method
• Blueshift of light rays induced by gravitational wave memory effect
• The Dirac equation: historical context, comparisons with the Schrödinger and Klein-Gordon equations, and elementary consequences